Box 25, Folder 13: Paleontology Notes 5? - Crinoidea B

Middle Silurian - Niagara shale Group

Lockport New York

[pen sketch]

Myelodactylus brachiatus

Genus

Onychocrinus Lyon + Casseday

Am Jour. Sci. 2d Ser. 29 p 77 (1860)

Onychocrinus exculpus Lyon & Casseday, Am Jour Sci. 2d Ser 29 p 78 (1860)

Sub Carboniferous

Kentucky + Indiana.

Crinoidea

4 p 292

Genus Pentremites, Say

Am. Jour. of Science Vol. 2 p 36 (1820)

Gen. Ch. Body subglobular or oblong, elevated upon an articulated trunk; pelvis pentagonal, more or less abruptly attenuated at the base; ambulacra five, co incomplete, radiating from the summit & terminating each side at the angles of the pentagon, each with numerous transverse striae, a longitudinal indented line, two sutures, and numerous transverse impressed lines, which alternate with a marginal series of oblong pores; intersticial spaces (included between the ambulacra) triangular, equal, with a longitudinal suture; apex perforated by five rounded foramina, & an angulated central one; ossa innominata large rhombic; trunk branched? cylindrical, articulated elongated; segments perforated, articulating surfaces with alternately elevated & depressed radii